Emission characteristics and performance comparison of polyfluorene lasers with one- and two-dimensional distributed feedback

George Heliotis, Ruidong Xia, Graham A. Turnbull, Piers Andrew, William L. Barnes, Ifor D.W. Samuel, Donal D.C. Bradley

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176 Scopus citations

Abstract

We report the fabrication of optically pumped solid-state polymer lasers based on the semiconducting polymer poly(9,9-dioctyl-fluorene) (PFO) using resonator structures that offer one- and two-dimensional distributed feedback. The lasers are readily fabricated by solution deposition of thin polymer films on top of suitable grating microstructures etched into fused silica substrates. The devices operate in the blue spectral region, are highly efficient (slope efficiencies as high as 7.8% are demonstrated), and exhibit very low threshold energies for oscillation (0.8 nJ per pulse). The operating characteristics of the lasers are investigated in detail. The transverse mode profiles and divergence of the output beams are measured and correlated with the internal lasing modes and the feedback mechanism present in the resonators. Additionally, broadband tuning of the emission wavelength over a range of ∼ 40 nm is demonstrated by controlling the supported resonant frequency of the laser cavities.
Original languageEnglish (US)
JournalAdvanced Functional Materials
Volume14
Issue number1
DOIs
StatePublished - Jan 1 2004
Externally publishedYes

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